RDCMan is a remote desktop connection manager that can add sanity when you have to deal with a large number of servers. I recently finished a job working with 135 SharePoint servers in 18 farms – trying to handle that with .rdc connections would’ve drive me insane.
The reason I’m posting this – if you look in the blog article I linked, you’ll see nested groups in the left hand pane with the servers. But reading the comments, you’ll note a lot of folks commenting they can’t create groups within groups. I’ve had the same problem, and it’s a bit frustrating.
I finally figured out the issue – you can’t have a group that contains both servers and other groups. You can either have a group that has other groups in it, or a group with servers in it. So if you have created a bunch of server groups, put some servers in it, then try to create a group within the group, you won’t be able to.
So if you’re struggling with trying to figure out why that guy did it, but you can’t – odds are that’s the reason why. Hope this helps.